a(n) = A005940(1+A163511(n)).

Terms

a(0) =2a(1) =3a(2) =5a(3) =4a(4) =7a(5) =10a(6) =9a(7) =6a(8) =11a(9) =36a(10) =21a(11) =50a(12) =25a(13) =16a(14) =15a(15) =8a(16) =13a(17) =154a(18) =225a(19) =486a(20) =55a(21) =84a(22) =147a(23) =98a(24) =49a(25) =90a(26) =81a(27) =28a(28) =35a(29) =30